Summer's ending, and it's time to start packing and preparing for school. That means finding some money for those uber-expensive textbooks you'll only need for 9 months. The Amazon Student app will let you trade in the old ones for new swag.

While the app won't give you cash for your old copy of Introduction to Forensic Anthropology (ugh), it will give you a price ballpark that you can feed into an Amazon Gift Card, as well as the ability to sell the book to other students signed up to the program. You can even trade-in the old movies and video games you got to distract you from your studies. Good deal. And it's free. [iTunes via TechCrunch]